First of all, thank you Doctor Moc, your prescription helped me... instead of
<script src="sorttable.js"></script>
I now use
<script src="/sorttable.js"></script>
Second, I wonder if people really can comprehend how extraordinary frustrating it is to maintain a simple web site these days, when a single slash makes all the difference? I'm telling you, it's harder than most users can imagine Thanx again.
EDIT: I forgot to tell you that I use sorttable on download.php as well, check it out! I would suggest the dev team to integrate it into e107 - it's pretty useful.